well fnd Sections StandardLIB Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
TheoremName
Thm* r1:(T1T1Prop), r2:(T2T2Prop).
Thm* T1 = T2
Thm* 
Thm* (x,y:T1r1(x,y r2(x,y))
Thm* 
Thm* (WellFnd{i}(T1;x,y.r1(x,y))  WellFnd{i}(T2;x,y.r2(x,y)))
[wellfounded_functionality_wrt_iff]
cites the following:
Thm* r1:(T1T1Prop), r2:(T2T2Prop).
Thm* T1 = T2
Thm* 
Thm* (x,y:T1r1(x,y r2(x,y))
Thm* 
Thm* WellFnd{i}(T1;x,y.r1(x,y))  WellFnd{i}(T2;x,y.r2(x,y))
[wellfounded_functionality_wrt_implies]
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
well fnd Sections StandardLIB Doc